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git-merge-index(1) [centos man page]

GIT-MERGE-INDEX(1)						    Git Manual							GIT-MERGE-INDEX(1)

git-merge-index - Run a merge for files needing merging SYNOPSIS
git merge-index [-o] [-q] <merge-program> (-a | [--] <file>*) DESCRIPTION
This looks up the <file>(s) in the index and, if there are any merge entries, passes the SHA-1 hash for those files as arguments 1, 2, 3 (empty argument if no file), and <file> as argument 4. File modes for the three files are passed as arguments 5, 6 and 7. OPTIONS
-- Do not interpret any more arguments as options. -a Run merge against all files in the index that need merging. -o Instead of stopping at the first failed merge, do all of them in one shot - continue with merging even when previous merges returned errors, and only return the error code after all the merges. -q Do not complain about a failed merge program (a merge program failure usually indicates conflicts during the merge). This is for porcelains which might want to emit custom messages. If git merge-index is called with multiple <file>s (or -a) then it processes them in turn only stopping if merge returns a non-zero exit code. Typically this is run with a script calling Git's imitation of the merge command from the RCS package. A sample script called git merge-one-file is included in the distribution. ALERT ALERT ALERT! The Git "merge object order" is different from the RCS merge program merge object order. In the above ordering, the original is first. But the argument order to the 3-way merge program merge is to have the original in the middle. Don't ask me why. Examples: torvalds@ppc970:~/merge-test> git merge-index cat MM This is MM from the original tree. # original This is modified MM in the branch A. # merge1 This is modified MM in the branch B. # merge2 This is modified MM in the branch B. # current contents or torvalds@ppc970:~/merge-test> git merge-index cat AA MM cat: : No such file or directory This is added AA in the branch A. This is added AA in the branch B. This is added AA in the branch B. fatal: merge program failed where the latter example shows how git merge-index will stop trying to merge once anything has returned an error (i.e., cat returned an error for the AA file, because it didn't exist in the original, and thus git merge-index didn't even try to merge the MM thing). GIT
Part of the git(1) suite Git 06/10/2014 GIT-MERGE-INDEX(1)

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GIT-MERGE-BASE(1)						    Git Manual							 GIT-MERGE-BASE(1)

git-merge-base - Find as good common ancestors as possible for a merge SYNOPSIS
git merge-base [-a|--all] <commit> <commit>... git merge-base [-a|--all] --octopus <commit>... git merge-base --independent <commit>... DESCRIPTION
git merge-base finds best common ancestor(s) between two commits to use in a three-way merge. One common ancestor is better than another common ancestor if the latter is an ancestor of the former. A common ancestor that does not have any better common ancestor is a best common ancestor, i.e. a merge base. Note that there can be more than one merge base for a pair of commits. OPERATION MODE
As the most common special case, specifying only two commits on the command line means computing the merge base between the given two commits. More generally, among the two commits to compute the merge base from, one is specified by the first commit argument on the command line; the other commit is a (possibly hypothetical) commit that is a merge across all the remaining commits on the command line. As a consequence, the merge base is not necessarily contained in each of the commit arguments if more than two commits are specified. This is different from git-show-branch(1) when used with the --merge-base option. --octopus Compute the best common ancestors of all supplied commits, in preparation for an n-way merge. This mimics the behavior of git show-branch --merge-base. --independent Instead of printing merge bases, print a minimal subset of the supplied commits with the same ancestors. In other words, among the commits given, list those which cannot be reached from any other. This mimics the behavior of git show-branch --independent. OPTIONS
-a, --all Output all merge bases for the commits, instead of just one. DISCUSSION
Given two commits A and B, git merge-base A B will output a commit which is reachable from both A and B through the parent relationship. For example, with this topology: o---o---o---B / ---o---1---o---o---o---A the merge base between A and B is 1. Given three commits A, B and C, git merge-base A B C will compute the merge base between A and a hypothetical commit M, which is a merge between B and C. For example, with this topology: o---o---o---o---C / / o---o---o---B / / ---2---1---o---o---o---A the result of git merge-base A B C is 1. This is because the equivalent topology with a merge commit M between B and C is: o---o---o---o---o / / o---o---o---o---M / / ---2---1---o---o---o---A and the result of git merge-base A M is 1. Commit 2 is also a common ancestor between A and M, but 1 is a better common ancestor, because 2 is an ancestor of 1. Hence, 2 is not a merge base. The result of git merge-base --octopus A B C is 2, because 2 is the best common ancestor of all commits. When the history involves criss-cross merges, there can be more than one best common ancestor for two commits. For example, with this topology: ---1---o---A / X / ---2---o---o---B both 1 and 2 are merge-bases of A and B. Neither one is better than the other (both are best merge bases). When the --all option is not given, it is unspecified which best one is output. SEE ALSO
git-rev-list(1), git-show-branch(1), git-merge(1) GIT
Part of the git(1) suite Git 11/24/2012 GIT-MERGE-BASE(1)
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